WASHINGTON - Federal judges have blocked strict new immigration laws adopted by conservative legislatures in half a dozen states, including a ruling last week that said South Carolina may not set up a "street-level dragnet" to stop and arrest illegal immigrants.

But immigrant-rights advocates who have cheered those rulings may soon find their luck has run out as those rulings head for the Supreme Court. Legal experts believe the high court's conservative majority will take a sharply different approach.

So far, lower-court judges have mostly sided with the Obama administration, ruling, as U.S. District Judge Richard M. Gergel did in the South Carolina case, that regulating immigration is the province solely of the federal government, not the states.

"The clear message, from judges across the country, is that the states have overreached," said University of California-Davis law professor Gabriel Chin.

In addition to South Carolina, judges have blocked extensive parts of immigration laws in Arizona, Georgia, Indiana and Utah and some parts of an Alabama law.

In Georgia, for example, U.S. District Judge Thomas Thrash Jr. blocked parts of that state's law including one authorizing police to verify the immigration status of someone who can't provide proper identification. "The apparent legislative intent is to create such a climate of hostility, fear, mistrust and insecurity that all illegal aliens will leave Georgia," Thrash wrote in his June ruling.

A few days earlier, U.S. District Judge Sarah Evans Barker put on hold part of Indiana's law that authorized the arrest of anyone ordered deported by an immigration court. Last week in South Carolina, Gergel, an Obama appointee, blocked the state from giving police the authority to arrest and hold suspected illegal immigrants while checking their immigration status.

In Arizona, a federal judge backed by the U.S. Court of Appeals in San Francisco halted six parts of the state law, including one that made it a crime to lack immigration papers or to work in the state while in the country illegally.

In Alabama, a federal judge and the U.S. appeals court in Atlanta put on hold several provisions of that state's law, the strictest in the nation, including one that required schools to check the immigration status of new students.

Other major parts of the Alabama law were allowed to take effect, however, including the requirement that police check the immigration status of people who are lawfully stopped or taken into custody.

Immigrant-rights advocates say nearly all the judges have agreed that states cannot make immigration offenses a state crime.

"The common thread is that states can't be in the business of finding and locking up people they suspect of being undocumented immigrants," said Cecillia Wang, director of the national Immigrants' Rights Project of the American Civil Liberties Union. The Alabama ruling is the one notable exception to that trend.

Advocates for immigrants often describe the cases as being about civil rights and fears of racial profiling. But in court, the key question is whether states have the power to use their judges and state and local police to enforce policies against illegal immigration.

When Congress last revised the immigration laws, it said states may "cooperate" with the federal government in "the identification, apprehension, detention or removal of aliens not lawfully present in the United States." The states that have passed restrictive laws say that's exactly what they are doing.

The Obama administration disagrees. In its legal arguments against Arizona's law, the administration says the state's policies conflict with the federal government's emphasis on deporting violent criminals, drug dealers and smugglers who are in the country illegally, not the hundreds of thousands of otherwise law-abiding illegal immigrants who may be living and working here.

But in May, the Supreme Court signaled skepticism about a similar argument.

The justices upheld another Arizona law that punished employers who hire illegal workers. In his opinion, Chief Justice John G. Roberts Jr. sounded a states' rights theme and set a "high threshold" for striking down a state law on the grounds that it conflicted with the aims of the federal government.

Roberts' ruling was part of a trend on the high court that sweeps more broadly in addressing immigration disputes. In the last decade, the court increasingly has been reluctant to strike down state laws as being "pre-empted" by federal law unless Congress has clearly said that states have no role to play. Arizona lawyers played on that theme in their appeal.

Moreover, "the states have an inherent police power" within their borders, said former U.S. Solicitor General Paul D. Clement, who represents Arizona.

John Eastman, a law professor at Chapman University in Orange, Calif., said the Supreme Court was likely to look at immigration disputes differently from the lower courts. It is "a peculiar idea," he said, for the federal government to assert that states may not enforce immigration laws within their borders.

The high court said it would hear the Arizona immigration case in April, and Eastman said he expected the justices to divide along the same lines as in the May ruling upholding Arizona's sanctions on employers who hire illegal workers. Justices Antonin Scalia, Anthony M. Kennedy, Clarence Thomas and Samuel A. Alito Jr. joined with Roberts in that case.

Peter Spiro, a law professor at Temple University in Philadelphia, says he expected key parts of the Arizona law would be upheld. "As usual, Kennedy will be the decider," he said. "And I think he'll be accommodating of state interests."

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